TA8S Wheels
 
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TA8S Wheels

TA8S - The Best Flow Formed BMW Wheels for Track and Street
The TA8S is a flow-formed alloy wheel released by BimmerWorld in June, 2022.
 
TA8S wheels are made in 17" diameter and 18" diameter in a variety of widths and offsets. Our goal was to offer a wheel that sacrifices a little weight to add more strength. Our TA5R is a lightweight race wheel - now with years of proven race credentials - with huge brake clearance. For TA8S we wanted to build in more strength combined with classic CSL-inspired styling. The TA8S slots into our line-up of BMW wheels for street or track, complementing our split 5-spoke TA5R and forged split 8-spoke TA16. The TA8S is strong, inexpensive, fully-featured, light weight, and readily available in select sizes and offsets.
 
TA8S wheels are made in 17" diameter and 18" diameter in a variety of widths and offsets. Our goal for TA8S was to feature timeless CSL-inspired styling with 1st-in-class strength while adding some mass back into the construction. We aimed for a higher load rating, even though it meant adding weight, because we wanted a wheel that could take more abuse. This is key for newer, heavier platforms that require higher load ratings for safety and has a nice trickle-down effect for older, lighter vehicles. More strength is good for everyone. And if you're at the competition level where single pounds count we still offer a number of weight-focused wheels.
 
For the initial release of this wheel we have focused on popular fitments, sizes, and offsets. Additional sizes will be added in the future.

All TA8S wheels use the 5x120 bolt pattern and a 72.56 center bore, which are the standard wheel specs for many BMW models:
2 Series: M235i Racing/M240i Racing
3 Series: E36, E46, E90, E91, E92, E93, F30, F31, F36, F80, including M3
4 Series: F32, F33, F34, F82, F83, including M4
Z Series: Z3, E85, E86
M2: F87 M2 (non-Comp)
M3: E36 M3, E46 M3, E9X M3, F80 M3
M4: F82/F83 M4


Available Wheel Specs:
All listed sizes have a 5x120mm bolt pattern and 72.56mm center bore.
Size Offset (ET) Load Rating Weight (LBS) Face Profile
17x9.0 42 1,650 lbs 18.25 standard
18x9.5 35 1,650 lbs 20.15 concave 1
18x10.0 33 1,650 lbs 20.84 concave 2
18x10.0 25 1,650 lbs 20.92 concave 2

18x9.5" concave 1 on the left; 18x10.0" concave 2 on the right.



Flow Forming Wheel Process
 
Flow forming is a process that produces a semi-forged wheel barrel (rim) while using a cast center. Much of the strength in a wheel comes from the barrel and having a high-strength barrel gives an excellent basis for overall wheel strength. The traditional casting process creates wheels with pockets of air inside the aluminum grain. This makes the wheel more susceptible to bends or cracks. Fully forged wheels are machined from solid blocks of aluminum with a much tighter grain structure and nearly no air pockets. Flow forming is a process in between where the barrel is rolled down a mandrel similar to how a forged barrel is made. The flow-formed alloy grain is tight like a forged wheel. The wheel center/face is cast.

Flow-Form barrel on the mandrel.


Lessons Learned in Rigidity
 
Through our forged TA16 wheel and flow-formed TA5R programs, we knew the TA8S had to be rigid where it counted most: the barrel and the outer rim lips. The barrel in a flow formed wheel is made using a forging technique called roll forming. This makes the barrel extremely strong. We went a step further and added extra material to the inner rim lip. The inside lip is the most likely to bend due to the lack of a reinforcing face. So extra material here makes it stronger and more resistant to bending. On the outer face the spokes extend all the way to the lip edge to further reinforce the outer lip.
 
Fitment
 
We have launched the TA8S using common sizes and offsets for 3-series, 4-series, M2, M3, M4, and Z3/Z4 models. For the initial launch we focused on mixed street-track use - 17x9.0 square for E36 and E46; 18x9.5 square and 18x10.0 square for E46 M3 and E9X M3. As well as staggered sets for E46 M3, E9X M3, and F8X M3/M4 - 18x9.5 or 10.0. We looked at common spacer sizes and lowered the wheel offset to match. Even with big brakes the TA8S will rarely need spacers for clearance or a flush fit. We have a wheel that is an excellent fit for most applications!
 
M2/M3/M4 models use either a very low offset or a combination of low and high. We have a selection of wider wheels and low offsets for square track wheel sets as well as staggered sizes for high-torque cars that need extra rubber in the rear.
 

F80 M3 18x10 square set.


Brake Clearance
 
Our TA8S spokes and face profiles ensure the wheel clears a large variety of big brakes kits from BMW, StopTech, PFC, Brembo, and others. Our spokes have a slight concave profile, even in the high offset "flat" face design that curves around the big calipers. This means that you won't need to run a wheel spacer to clear many brake kits. In addition, the barrel has been designed to have proper clearances but not at the expense of strength. Some brake kits are a very tight fit but clear with the minimum recommended clearance of 3mm.
 

Modeling big brake kits for clearance. 18x10 ET33 shown for reference.


Testing
 
TA8S has passed the three tests performed under SAE J2530: Dynamic Cornering Fatigue Test, Dynamic Radial Fatigue Test, and an Impact Test. These tests are done to qualify the wheel's strengths and are a industry-accepted measure of wheel design and manufacturing quality. We used the SAE testing standards because it is more relevant to the US market. The SAE tests are the same as the JWL/VIA testing for the Japanese market but one of the SAE tests (Dynamic Radial Fatigue) is actually double the duration of the same VIA test, making it a more stringent test. Not all aftermarket wheel manufacturers bother with the testing as it is not required to sell wheels in the USA. Unfortunately, quality varies greatly in the marketplace. Some well-known wheel brands advertised as track wheels will not actually pass VIA/SAE testing! Wheel testing and certification has been a hot issue and it was important that we had our designs validated. Actual certificates are not required for the US or Canadian markets and we did not pursue registration for the Japanese market (VIA) or Germany/European Union (TUV).


FAQ

Are these better than Brand X wheel?
On paper, TA8S has similar, same, or better specs than all other wheels in the flow-form market. Wheel design is subjective but we love how these wheels look in person and photographs.
Where are they made?
TA8S is made in China. The factory is a Tier-1 OE supplier to a major auto manufacturer and has ISO certification.
Have they been tested?
All TA8S sizes have been tested and passed JWL/VIA and SAE standards using the approved testing equipment. We used the SAE standards for grading as it is slightly more stringent than the normal VIA standards and the SAE organization is more pertinent to the US market.
What is the load rating?
Both 17" and 18" have a 1,650lb (750kg) rating.
How much do they weigh?
17" weighs 18.25bs.
18" weighs less than 21lbs depending on size and offset.
What face profile do they come in?
All TA8S wheels have a concave face where the spokes curve in towards the hub. The spoke shape gives it generous caliper clearance. The high offset wheels have a mild concave face profile that we refer to as "the Standard face". The medium offset (33-35) is close to the standard profile but with a little more concavity because of the lower offset and we refer to it as Concave 1. The low offset wheels have noticeably more set-back profile and we refer to these as Concave 2.
What is flow-forming?
Flow-forming manufactures the wheel using casting and forging techniques. The face is cast to form it's shape. The barrel starts out as a cast piece but it's final shape is produced using a process similar to forgings. The strength of the wheel comes from the barrel most of all and the semi-forging process has greater strength than traditional casting.
What sizes do they come in?
17" diameter is currently only offered in a 9.0" width. We plan to expand with other widths and offsets in the future.
18" diameters are offered in 9.5" and 10.0" widths. We plan to expand with other widths and offsets in the future.
What colors do they come in?
We kept the colors simple: a bright silver, gloss gunmetal (anthracite), and a gloss black.
Will they fit my E82 1-series or F22 2-series?
None of the current TA8S production has been designed to fit the very high offsets for E82 and F22.
Will they fit my E39 5-series?
No they will not. The center bore of the TA8S is 72.56, which is smaller than the E39 center bore of 74.10.
Will they fit my 5/6/7/8-series?
Yes but also No. We have chosen sizes and offsets for the 3 and 4-series market. A 5/6/7/8-series model typically takes a lower offset than we initially produced, although some M3/M4 fitments may be close. You can make up this offset difference with wheel spacers. However, some models produced after 2009 are much heavier and require a wheel with a higher load rating. This is based on the axle weight of the car, which you can find on a sticker on the driver's door pillar (GVAWR and then divide by 2). The TA8S does not fit any 1996-2003 E39 5-series models.
What's included with the wheel?
One wheel and one center cap are included. Your factory wheel bolts and BMW center cap can be re-used or purchased separately. Any valve stem used on factory wheels will also work.
Will my BBK fit?
The 17" will clear most brakes up to 355mm with either 4 or 6-piston calipers.
The 18" will clear most brakes up to 380mm with 4 piston calipers, including PFC, StopTech, Brembo, and Wilwood. It does clear the StopTech 380mm/6-piston kit but a Brembo 380mm/6-piston is slightly too large but may fit with a spacer.
Always install wheel weights in the proper position to maintain clearances.
Will my TPMS sensor fit?
Yes, use your factory-recommended OEM TPMS sensor and valve stem.
Do you offer wholesale?
We welcome all wholesale inquiries and offer tiered pricing and other incentives.
Do you offer Group Buys?
No, we do not. To keep the sales process simple we do not offer or participate in Group Buys. We do have occasional sales across the catalog and encourage you to sign up for our newsletter emails.
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BimmerWorld TA8S 17 inch Flow-Form Wheel - E36, E46, E9X, F3X, Z3, Z4

Strong, lightweight, flow-formed, large brake clearance, classic style

Price: $278.99

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BimmerWorld TA8S 18 inch Flow-Form Wheel - E46 M3, E9X M3, F8X M2/M3/M4

Strong, lightweight, flow-formed, large brake clearance, classic style

Price: $343.99 – $353.99

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